Reading SPAM BOX with Eudora or outlook

It's maybe a stupid question but can anyone tell me how to configure eudora or outlook to read the spam box?
I allready added a IMAP account to eudora but what's the login and password I have to use? I allready tried the one of the main account but it doesn't work. I can specify the IMAP mailbox location prefix but I don't know what to put there.
Can anyone help me?